The Assabet River flows north about 30 miles from its headwaters in Westborough, through the now densely developed urban centers of Northborough, Hudson, and Maynard, to its confluence with the Sudbury River at historic Egg Rock in Concord, where the Concord River begins. The Sudbury River also has its beginnings in Westborough, flowing eastward from the Great Cedar Swamp toward Framingham. It then proceeds north through the Towns of Sudbury, Wayland, and Lincoln, then into the Town of Concord. The SuAsCo encompasses all or part of 36 municipalities and supports a population of 365,000 people.
Twenty-nine free-flowing miles of the three major rivers in the SuAsCo Watershed were designated as Wild and Scenic on April 9, 1999. The rivers were recognized for their outstanding ecological, historical, scenic, and recreational values, as well as their lasting place in American literature. The SuAsCo also encompasses two National Wildlife Refuges (NWRs) - the Great Meadows NWR, located primarily in Sudbury, and the Assabet NWR, located primarily in Stow. The SuAsCo also has the Commonwealth's first designated Area of Critical Environmental Concern - the Great Cedar Swamp located in Westborough. The Great Meadows NWR and the Great Cedar Swamp represent the two of the largest wetlands in Central Massachusetts.
- Gather sufficient water quality data to help determine the areas most affected by point and nonpoint source pollution
- Work to understand watershed hydrology to aid in decisions concerning the Inter-Basin Transfer Act and Water Management Act permit requests
- Work to maintain a healthy and seasonal variability of streamflow to sustain aquatic and terrestrial biodiversity
- Decrease impervious surface area and local water consumption
Alewife spawning occurred in the Concord River for the first time since the early 19th Century. The Middleborough-Lakeville Herring Fisheries Commission provided 7,500 alewives for reintroduction this year and plans to introduce 7,500 more alewives in each of the next two years.
- SuAsCo Watershed Assessment Report file size 104MB
- SuAsCo Watershed Action Plan file size 10MB
- Greenprint for Growth in the SuAsCo
- SuAsCo Biodiversity Protection and Stewardship Plan
- The Greenways Plan for the SuAsCo Watershed
- Assabet River TMDL for Phosphorus Renewable Energy Projects at State Agencies: A step-by-step Guide to Identifying, Planning and Funding Projects (MassDEP)
OARS: For the Assabet, Sudbury, and Concord Rivers
Sudbury Conservation Commission
Lowell Parks and Conservation Trust
Adopt-a-Stream SuAsCo Page (EEA's Riverways)
Sudbury Valley Trustees
Hop Brook Protection Association
Sudbury, Assabet, and Concord Rivers Wild & Scenic River Designation (National Park Service)
Sudbury, Assabet, and Concord Wild & Scenic River Stewardship Council
This information is provided by the Executive Office of Energy and Environmental Affairs, Office of Water Policy